Relationship between swimming performance and fluid force determined by pressure distribution analysis of breaststroke kicking motion

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  • Tsunokawa Takaaki
    Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Takagi Hideki
    Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Sengoku Yasuo
    Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Tsubakimoto Shozo
    Graduate School of Comprehensive Human Sciences, University of Tsukuba

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Other Title
  • 平泳ぎ泳パフォーマンスと圧力分布から推定した足部流体力との関係
  • ヒラオヨギエイパフォーマンス ト アツリョク ブンプ カラ スイテイ シタ ソクブ リュウタイリョク ト ノ カンケイ

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Abstract

The purpose of this study was to identify the relationship between swimming performance and estimated fluid force by pressure distribution analysis of breaststroke kicking motion. Eleven elite male swimmers participated in the study, and provided written informed consent. Each subject performed the breaststroke kicking motion for 10 seconds without upper limb motion at maximal effort. During the trial, the subjects were connected to a load-cell via a polyethylene rope for measurement of tethered force (Ftethe) at 200 Hz. Eight pressure sensors were attached to the right foot to measure the the distribution of pressure on the foot. Resulting fluid force acting on the foot (Ffoot) was calculated from the product of measured pressure values and the area of the foot. Using coordinates of the right foot calculated using the 3D-DLT method, the estimated fluid force, propulsive force (Fprop), vertical force (Fvert) and lateral force (Flater) exerted by the right foot were computed. The competitive swimming velocity (v100) was calculated based on the personal best time over 100 m. Pearson's correlation coefficient (r) was used to investigate relationships among estimated fluid forces, Ftethe and v100. There were no significant correlations for v100 and mean Ftethe. The value of v100 showed significant correlations with the mean Ffoot (r=.734, p<.01), mean Fprop (r=−.741, p<.01), impulse of Ffoot (r=.742, p<.01), impulse of Fprop (r=−.757, p<.01), peak of Ffoot (r=.753, p<.01), and peak of Fprop (r=−.751, p<.01). During the trial, Fvert and Flater corresponded to the kicking motion. These results suggest that there are close relationships between swimming performance and estimating fluid forces acting on the foot. Therefore, the method used for estimating fluid force acting on the foot in this study appears to be a useful tool for evaluation of swimming performance.<br>

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